Optical spectroscopy of Eu3+ ions doped in KLu(WO4)2 single crystals

Europium single doped potassium lutetium tungstate Eu3+:KLu(WO4)2 single crystals have been grown with the top seeded solution growth slow cooling method. Their absorption spectra are studied in detail for principal light polarizations, E||Np, Nm and Ng at room and low temperatures. The absorption oscillator strengths parameters are calculated by means of the theory of f-f transition intensities for systems with anomalously strong configuration interaction and by Judd-Ofelt theory. The Ωt (t=2, 4, 6) intensity parameters, and the {Odk, Ock, Δd, Δc1 and Δc2} (k=1, 2, 3) ASCI parameters are calculated. The radiative transition rates AR, radiative lifetimes τR, and fluorescent branching ratios βR associated with 5D0-7FJ transitions of Eu3+ were determined. The calculated decay times are discussed and compared with experimental values.